a statement that is necessarily true (such as "She will win the election or she won`t.")

She didn’t proved anything. It’s a tautology to propose as a premise that "All men are pigs," and that "Bob is therefore a pig because he’s a man." The "proof" is in the premise—which is to say, there is no proof.

As a logical proposition, that paragraph can be reduced to the following: Because A, therefore A—the sort of tautology that would get any high school student a failing grade.